mount_lfs.c revision 1.9.4.2
1 /* $NetBSD: mount_lfs.c,v 1.9.4.2 2001/02/03 21:43:18 he Exp $ */ 2 3 /*- 4 * Copyright (c) 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 __COPYRIGHT("@(#) Copyright (c) 1993, 1994\n\ 39 The Regents of the University of California. All rights reserved.\n"); 40 #endif /* not lint */ 41 42 #ifndef lint 43 #if 0 44 static char sccsid[] = "@(#)mount_lfs.c 8.4 (Berkeley) 4/26/95"; 45 #else 46 __RCSID("$NetBSD: mount_lfs.c,v 1.9.4.2 2001/02/03 21:43:18 he Exp $"); 47 #endif 48 #endif /* not lint */ 49 50 #include <sys/param.h> 51 #include <sys/mount.h> 52 53 #include <ufs/ufs/ufsmount.h> 54 55 #include <err.h> 56 #include <errno.h> 57 #include <stdio.h> 58 #include <stdlib.h> 59 #include <string.h> 60 #include <unistd.h> 61 #include <paths.h> 62 63 #include <signal.h> 64 65 #include "mntopts.h" 66 #include "pathnames.h" 67 68 const struct mntopt mopts[] = { 69 MOPT_STDOPTS, 70 MOPT_UPDATE, 71 { NULL } 72 }; 73 74 int main __P((int, char *[])); 75 int mount_lfs __P((int, char *[])); 76 static void invoke_cleaner __P((char *)); 77 static void usage __P((void)); 78 static void kill_daemon __P((char *)); 79 static void kill_cleaner __P((char *)); 80 81 int short_rds, cleaner_debug, cleaner_bytes; 82 char *nsegs; 83 84 int 85 main(argc, argv) 86 int argc; 87 char *argv[]; 88 { 89 struct ufs_args args; 90 int ch, mntflags, noclean, mntsize, oldflags, i; 91 char *fs_name, *options; 92 93 const char *errcause; 94 struct statfs *mntbuf; 95 96 options = NULL; 97 nsegs = "4"; 98 mntflags = noclean = 0; 99 cleaner_bytes = 1; 100 while ((ch = getopt(argc, argv, "dN:no:s")) != -1) 101 switch (ch) { 102 case 'b': 103 cleaner_bytes = !cleaner_bytes; 104 break; 105 case 'd': 106 cleaner_debug = 1; 107 break; 108 case 'n': 109 noclean = 1; 110 break; 111 case 'N': 112 nsegs = optarg; 113 break; 114 case 'o': 115 getmntopts(optarg, mopts, &mntflags, 0); 116 break; 117 case 's': 118 short_rds = 1; 119 break; 120 case '?': 121 default: 122 usage(); 123 } 124 argc -= optind; 125 argv += optind; 126 127 if (argc != 2) 128 usage(); 129 130 args.fspec = argv[0]; /* the name of the device file */ 131 fs_name = argv[1]; /* the mount point */ 132 133 #define DEFAULT_ROOTUID -2 134 args.export.ex_root = DEFAULT_ROOTUID; 135 if (mntflags & MNT_RDONLY) { 136 args.export.ex_flags = MNT_EXRDONLY; 137 noclean = 1; 138 } else 139 args.export.ex_flags = 0; 140 141 /* 142 * Record the previous status of this filesystem (if any) before 143 * performing the mount, so we can know whether to start or 144 * kill the cleaner process below. 145 */ 146 oldflags = MNT_RDONLY; /* If not mounted, pretend r/o */ 147 if (mntflags & MNT_UPDATE) { 148 if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) 149 err(1, "getmntinfo"); 150 for (i = 0; i < mntsize; i++) { 151 if (strcmp(mntbuf[i].f_mntfromname, args.fspec) == 0) { 152 oldflags = mntbuf[i].f_flags; 153 break; 154 } 155 } 156 } 157 158 if (mount(MOUNT_LFS, fs_name, mntflags, &args)) { 159 switch (errno) { 160 case EMFILE: 161 errcause = "mount table full"; 162 break; 163 case EINVAL: 164 if (mntflags & MNT_UPDATE) 165 errcause = 166 "specified device does not match mounted device"; 167 else 168 errcause = "incorrect super block"; 169 break; 170 default: 171 errcause = strerror(errno); 172 break; 173 } 174 errx(1, "%s on %s: %s", args.fspec, fs_name, errcause); 175 } 176 177 /* Not mounting fresh or upgrading to r/w; don't start the cleaner */ 178 if (!(oldflags & MNT_RDONLY) || (mntflags & MNT_RDONLY)) 179 noclean = 1; 180 if (!noclean) 181 invoke_cleaner(fs_name); 182 /* NOTREACHED */ 183 184 /* Downgrade to r/o; kill the cleaner */ 185 if ((mntflags & MNT_RDONLY) && !(oldflags & MNT_RDONLY)) 186 kill_cleaner(fs_name); 187 188 exit(0); 189 } 190 191 static void 192 kill_daemon(pidname) 193 char *pidname; 194 { 195 FILE *fp; 196 char s[80]; 197 pid_t pid; 198 199 fp = fopen(pidname, "r"); 200 if (fp) { 201 fgets(s, 80, fp); 202 pid = atoi(s); 203 if (pid) 204 kill(pid, SIGINT); 205 fclose(fp); 206 } 207 } 208 209 static void 210 kill_cleaner(name) 211 char *name; 212 { 213 char *pidname; 214 char *cp; 215 int off; 216 217 /* Parent first */ 218 pidname = malloc(strlen(name) + 20 + strlen(_PATH_VARRUN)); 219 sprintf(pidname, "%slfs_cleanerd:m:%s.pid", _PATH_VARRUN, name); 220 off = strlen(_PATH_VARRUN); 221 while((cp = strchr(pidname + off, '/')) != NULL) 222 *cp = '|'; 223 kill_daemon(pidname); 224 225 /* Then child */ 226 sprintf(pidname, "%slfs_cleanerd:s:%s.pid", _PATH_VARRUN, name); 227 off = strlen(_PATH_VARRUN); 228 while((cp = strchr(pidname + off, '/')) != NULL) 229 *cp = '|'; 230 kill_daemon(pidname); 231 } 232 233 static void 234 invoke_cleaner(name) 235 char *name; 236 { 237 char *args[6], **ap = args; 238 239 /* Build the argument list. */ 240 *ap++ = _PATH_LFS_CLEANERD; 241 if (cleaner_bytes) 242 *ap++ = "-b"; 243 if (nsegs) { 244 *ap++ = "-n"; 245 *ap++ = nsegs; 246 } 247 if (short_rds) 248 *ap++ = "-s"; 249 if (cleaner_debug) 250 *ap++ = "-d"; 251 *ap++ = name; 252 *ap = NULL; 253 254 execv(args[0], args); 255 err(1, "exec %s", _PATH_LFS_CLEANERD); 256 } 257 258 void 259 usage() 260 { 261 (void)fprintf(stderr, 262 "usage: mount_lfs [-dns] [-o options] special node\n"); 263 exit(1); 264 } 265
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